If riding a giant log down a steep mountain sounds like an ideal way to spend a quiet spring afternoon, theOnbashira Festival is for you. Held every 6 years in Nagano, Japan, the festival involves moving enormous logs over difficult terrain completely by hand with the help of thickly braided ropes and an occasional assist from gravity as the logs barrel down hills. The purpose is to symbolically renew a nearby shrine where each log is eventually placed to support the foundation of several shrine buildings. The event has reportedly continued uninterrupted for 1,200 years.